On 02/27/2018 06:51 PM, Drew G. Wallace wrote:
Did you add repositories? Did you try a "sudo apt-get upgrade --allow-unauthenticated" from terminal and view the pending package updates in question? Better to narrow the repository in question and authenticate with the source, in my opinion.

I just tried that.

rsteff@ENU-2:~$ sudo apt-get upgrade --allow-unauthenticated
[sudo] password for rsteff:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  gnome-sudoku libdrm-amdgpu1 libdrm-amdgpu1:i386 libdrm2 libdrm2:i386 libegl1-mesa libegl1-mesa:i386 libgbm1 libgbm1:i386   libgl1-mesa-dri libgl1-mesa-dri:i386 libmm-glib0 libqmi-proxy libreoffice-avmedia-backend-gstreamer libreoffice-base-core   libreoffice-calc libreoffice-common libreoffice-core libreoffice-draw libreoffice-gnome libreoffice-gtk2   libreoffice-help-en-us libreoffice-impress libreoffice-ogltrans libreoffice-pdfimport libreoffice-style-galaxy   libreoffice-style-tango libreoffice-writer libwayland-egl1-mesa libwayland-egl1-mesa:i386 libxatracker2 mesa-vdpau-drivers
  mesa-vdpau-drivers:i386 modemmanager
The following packages will be upgraded:
  apparmor apt apt-transport-https apt-utils base-files bsdutils compiz compiz-core compiz-gnome compiz-mate compiz-plugins   compiz-plugins-default distro-info-data fonts-opensymbol fwupdate fwupdate-signed gir1.2-unity-5.0 gnome-disk-utility   grub-common grub-efi-amd64 grub-efi-amd64-bin grub-efi-amd64-signed grub2-common iproute iproute2 libapache2-mod-php   libapache2-mod-php7.0 libapparmor-perl libapparmor1 libapt-inst2.0 libapt-pkg5.0 libaudit-common libaudit1 libblkid1   libcompizconfig0 libdecoration0 libdrm-intel1 libdrm-intel1:i386 libdrm-nouveau2 libdrm-nouveau2:i386 libdrm-radeon1   libdrm-radeon1:i386 libfdisk1 libfwup0 libgl1-mesa-glx libgl1-mesa-glx:i386 libglapi-mesa libglapi-mesa:i386 libgles1-mesa   libgles2-mesa libmbim-glib4 libmbim-proxy libmount1 libnuma1 libosmesa6 libosmesa6:i386 libparted2 libpulse-mainloop-glib0   libpulse0 libpulse0:i386 libpulsedsp libpython-stdlib libpython2.7 libpython2.7-minimal libpython2.7-stdlib   libreoffice-style-human libsane libsane:i386 libsane-common libseccomp2 libsmartcols1 libunity-control-center1   libunity-protocol-private0 libunity-scopes-json-def-desktop libunity9 libuuid1 libuuid1:i386 libxnvctrl0 mount ntp   nvidia-settings parted php php-common php-mcrypt php-mysql php7.0 php7.0-cli php7.0-common php7.0-gd php7.0-intl php7.0-json   php7.0-mbstring php7.0-mcrypt php7.0-mysql php7.0-opcache php7.0-readline php7.0-xml php7.0-zip pulseaudio   pulseaudio-module-bluetooth pulseaudio-module-x11 pulseaudio-utils python python-apt-common python-gdbm python-minimal   python2.7 python2.7-minimal python3-apt python3-distupgrade qemu-slof resolvconf sane-utils sensible-utils shim shim-signed   skypeforlinux squashfs-tools ubuntu-drivers-common ubuntu-mono ubuntu-release-upgrader-core ubuntu-release-upgrader-gtk   unattended-upgrades unity-control-center-faces uno-libs3 ure util-linux uuid-runtime virtualbox-5.1   xserver-xorg-core-hwe-16.04 xserver-xorg-legacy-hwe-16.04 xserver-xorg-video-amdgpu-hwe-16.04   xserver-xorg-video-ati-hwe-16.04 xserver-xorg-video-nouveau-hwe-16.04 xserver-xorg-video-radeon-hwe-16.04
136 upgraded, 0 newly installed, 0 to remove and 34 not upgraded.
Need to get 179 MB/179 MB of archives.
After this operation, 23.5 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
WARNING: The following packages cannot be authenticated!
  virtualbox-5.1
Authentication warning overridden.
Get:1 https://repo.skype.com/deb stable/main amd64 skypeforlinux amd64 8.16.0.4 [74.1 MB] Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 base-files amd64 9.4ubuntu4.6 [55.0 kB] Get:3 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial/main amd64 fonts-opensymbol all 2:102.10+LibO6.0.1~rc1-0ubuntu0.16.04.1~lo1 [283 kB] Get:4 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 bsdutils amd64 1:2.27.1-6ubuntu3.4 [51.5 kB] Get:5 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 util-linux amd64 2.27.1-6ubuntu3.4 [849 kB] Get:6 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 mount amd64 2.27.1-6ubuntu3.4 [121 kB] Get:7 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libapt-pkg5.0 amd64 1.2.25 [706 kB] Get:8 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libapt-inst2.0 amd64 1.2.25 [55.5 kB] Get:9 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apt amd64 1.2.25 [1,041 kB] Get:10 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apt-utils amd64 1.2.25 [196 kB] Get:11 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 uuid-runtime amd64 2.27.1-6ubuntu3.4 [26.1 kB] Get:12 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ntp amd64 1:4.2.8p4+dfsg-3ubuntu5.8 [518 kB] Get:13 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpython2.7 amd64 2.7.12-1ubuntu0~16.04.3 [1,070 kB] Err:14 http://download.virtualbox.org/virtualbox/debian xenial/contrib amd64 virtualbox-5.1 amd64 5.1.34-121010~Ubuntu~xenial
  404  Not Found
Get:15 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python2.7 amd64 2.7.12-1ubuntu0~16.04.3 [224 kB] Get:16 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpython2.7-stdlib amd64 2.7.12-1ubuntu0~16.04.3 [1,880 kB] Get:17 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python2.7-minimal amd64 2.7.12-1ubuntu0~16.04.3 [1,261 kB] Get:18 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpython2.7-minimal amd64 2.7.12-1ubuntu0~16.04.3 [340 kB] Get:19 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python-minimal amd64 2.7.12-1~16.04 [28.1 kB] Get:20 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python amd64 2.7.12-1~16.04 [137 kB] Get:21 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpython-stdlib amd64 2.7.12-1~16.04 [7,768 B] Get:22 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python-apt-common all 1.1.0~beta1ubuntu0.16.04.1 [16.0 kB] Get:23 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python3-apt amd64 1.1.0~beta1ubuntu0.16.04.1 [137 kB] Get:24 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ubuntu-drivers-common amd64 1:0.4.17.7 [49.9 kB] Get:25 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libosmesa6 i386 17.2.8-0ubuntu0~16.04.1 [1,326 kB] Get:26 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libosmesa6 amd64 17.2.8-0ubuntu0~16.04.1 [1,250 kB] Get:27 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libgles2-mesa amd64 17.2.8-0ubuntu0~16.04.1 [13.4 kB] Get:28 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libgl1-mesa-glx i386 17.2.8-0ubuntu0~16.04.1 [138 kB] Get:29 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libgl1-mesa-glx amd64 17.2.8-0ubuntu0~16.04.1 [130 kB] Get:30 http://ppa.launchpad.net/rolfbensch/sane-git/ubuntu xenial/main amd64 libsane amd64 1.0.27+git20180225-xenial0 [2,093 kB] Get:31 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libglapi-mesa amd64 17.2.8-0ubuntu0~16.04.1 [22.8 kB] Get:32 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libglapi-mesa i386 17.2.8-0ubuntu0~16.04.1 [22.9 kB] Get:33 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 grub-efi-amd64-signed amd64 1.66.17+2.02~beta2-36ubuntu3.17 [297 kB] Get:34 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 grub-efi-amd64 amd64 2.02~beta2-36ubuntu3.17 [65.9 kB] Get:35 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 grub-efi-amd64-bin amd64 2.02~beta2-36ubuntu3.17 [661 kB] Get:36 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 shim-signed amd64 1.33.1~16.04.1+13-0ubuntu2 [316 kB] Get:37 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 shim amd64 13-0ubuntu2 [440 kB] Get:38 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 grub2-common amd64 2.02~beta2-36ubuntu3.17 [511 kB] Get:39 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 grub-common amd64 2.02~beta2-36ubuntu3.17 [1,705 kB] Get:40 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libapparmor1 amd64 2.10.95-0ubuntu2.8 [31.4 kB] Get:41 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libaudit-common all 1:2.4.5-1ubuntu2.1 [3,924 B] Get:42 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libaudit1 amd64 1:2.4.5-1ubuntu2.1 [36.2 kB] Get:43 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libuuid1 i386 2.27.1-6ubuntu3.4 [16.3 kB] Get:44 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libuuid1 amd64 2.27.1-6ubuntu3.4 [15.2 kB] Get:45 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libblkid1 amd64 2.27.1-6ubuntu3.4 [107 kB] Get:46 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libfdisk1 amd64 2.27.1-6ubuntu3.4 [139 kB] Get:47 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libmount1 amd64 2.27.1-6ubuntu3.4 [114 kB] Get:48 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libseccomp2 amd64 2.3.1-2.1ubuntu2~16.04.1 [38.7 kB] Get:49 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libsmartcols1 amd64 2.27.1-6ubuntu3.4 [62.8 kB] Get:50 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 distro-info-data all 0.28ubuntu0.7 [4,334 B] Get:51 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 iproute2 amd64 4.3.0-1ubuntu3.16.04.3 [522 kB] Get:52 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 resolvconf all 1.78ubuntu6 [51.8 kB] Get:53 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libapparmor-perl amd64 2.10.95-0ubuntu2.8 [31.4 kB] Get:54 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apparmor amd64 2.10.95-0ubuntu2.8 [450 kB] Get:55 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apt-transport-https amd64 1.2.25 [26.1 kB] Get:56 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libnuma1 amd64 2.0.11-1ubuntu1.1 [21.0 kB] Get:57 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 parted amd64 3.2-15ubuntu0.1 [42.4 kB] Get:58 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libparted2 amd64 3.2-15ubuntu0.1 [115 kB] Get:59 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ubuntu-release-upgrader-gtk all 1:16.04.24 [9,302 B] Get:60 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ubuntu-release-upgrader-core all 1:16.04.24 [29.6 kB] Get:61 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python3-distupgrade all 1:16.04.24 [104 kB] Get:62 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libcompizconfig0 amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [118 kB] Get:63 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 compiz-gnome amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [127 kB] Get:64 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 compiz-plugins amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [1,738 kB] Get:65 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 compiz-plugins-default amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [820 kB] Get:66 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libdecoration0 amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [52.0 kB] Get:67 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 compiz-core amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [348 kB] Get:68 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 compiz all 1:0.9.12.3+16.04.20171116-0ubuntu1 [3,866 B] Get:69 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 compiz-mate amd64 1:0.9.12.3+16.04.20171116-0ubuntu1 [5,758 B] Get:70 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 fwupdate-signed amd64 1.11.3+0.5-2ubuntu7 [28.1 kB] Get:71 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 fwupdate amd64 0.5-2ubuntu7 [34.3 kB] Get:72 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libfwup0 amd64 0.5-2ubuntu7 [13.4 kB] Get:73 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libunity9 amd64 7.1.4+16.04.20180209.1-0ubuntu1 [199 kB] Get:74 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libunity-protocol-private0 amd64 7.1.4+16.04.20180209.1-0ubuntu1 [78.7 kB] Get:75 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libunity-scopes-json-def-desktop all 7.1.4+16.04.20180209.1-0ubuntu1 [3,548 B] Get:76 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 gir1.2-unity-5.0 amd64 7.1.4+16.04.20180209.1-0ubuntu1 [20.2 kB] Get:77 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 gnome-disk-utility amd64 3.18.3.1-1ubuntu1.1 [198 kB] Get:78 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 iproute all 1:4.3.0-1ubuntu3.16.04.3 [2,430 B] Get:79 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php-common all 1:35ubuntu6.1 [10.8 kB] Get:80 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 php7.0-zip amd64 7.0.25-0ubuntu0.16.04.1 [19.8 kB] Get:81 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 php7.0-mcrypt amd64 7.0.25-0ubuntu0.16.04.1 [14.4 kB] Get:82 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 php7.0-mbstring amd64 7.0.25-0ubuntu0.16.04.1 [466 kB] Get:83 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 php7.0-intl amd64 7.0.25-0ubuntu0.16.04.1 [126 kB] Get:84 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-xml amd64 7.0.25-0ubuntu0.16.04.1 [113 kB] Get:85 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-readline amd64 7.0.25-0ubuntu0.16.04.1 [12.8 kB] Get:86 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-opcache amd64 7.0.25-0ubuntu0.16.04.1 [77.0 kB] Get:87 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-mysql amd64 7.0.25-0ubuntu0.16.04.1 [124 kB] Get:88 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-json amd64 7.0.25-0ubuntu0.16.04.1 [16.8 kB] Get:89 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-gd amd64 7.0.25-0ubuntu0.16.04.1 [27.2 kB] Get:90 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0 all 7.0.25-0ubuntu0.16.04.1 [1,290 B] Get:91 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libapache2-mod-php7.0 amd64 7.0.25-0ubuntu0.16.04.1 [1,229 kB] Get:92 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-cli amd64 7.0.25-0ubuntu0.16.04.1 [1,287 kB] Get:93 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php7.0-common amd64 7.0.25-0ubuntu0.16.04.1 [840 kB] Get:94 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libapache2-mod-php all 1:7.0+35ubuntu6.1 [2,990 B] Get:95 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libdrm-intel1 i386 2.4.83-1~16.04.1 [63.9 kB] Get:96 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libdrm-intel1 amd64 2.4.83-1~16.04.1 [59.9 kB] Get:97 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libdrm-nouveau2 amd64 2.4.83-1~16.04.1 [16.3 kB] Get:98 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libdrm-nouveau2 i386 2.4.83-1~16.04.1 [18.2 kB] Get:99 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libdrm-radeon1 amd64 2.4.83-1~16.04.1 [21.5 kB] Get:100 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libdrm-radeon1 i386 2.4.83-1~16.04.1 [23.1 kB] Get:101 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libgles1-mesa all 17.2.8-0ubuntu0~16.04.1 [3,312 B] Get:102 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libmbim-proxy amd64 1.14.0-1ubuntu0.16.04.1 [5,458 B] Get:103 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libmbim-glib4 amd64 1.14.0-1ubuntu0.16.04.1 [65.6 kB] Get:104 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 pulseaudio-module-x11 amd64 1:8.0-0ubuntu3.8 [16.0 kB] Get:105 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 pulseaudio-module-bluetooth amd64 1:8.0-0ubuntu3.8 [58.6 kB] Get:106 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 pulseaudio amd64 1:8.0-0ubuntu3.8 [766 kB] Get:107 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 pulseaudio-utils amd64 1:8.0-0ubuntu3.8 [51.0 kB] Get:108 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpulsedsp amd64 1:8.0-0ubuntu3.8 [21.1 kB] Get:109 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpulse-mainloop-glib0 amd64 1:8.0-0ubuntu3.8 [11.5 kB] Get:110 http://us.archive.ubuntu.com/ubuntu xenial-updates/main i386 libpulse0 i386 1:8.0-0ubuntu3.8 [253 kB] Get:111 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpulse0 amd64 1:8.0-0ubuntu3.8 [249 kB] Get:112 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libunity-control-center1 amd64 15.04.0+16.04.20171130-0ubuntu1 [81.1 kB] Get:113 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php all 1:7.0+35ubuntu6.1 [2,862 B] Get:114 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 php-mcrypt all 1:7.0+35ubuntu6.1 [1,934 B] Get:115 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 php-mysql all 1:7.0+35ubuntu6.1 [1,928 B] Get:116 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python-gdbm amd64 2.7.12-1~16.04 [11.9 kB] Get:117 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 squashfs-tools amd64 1:4.3-3ubuntu2.16.04.1 [104 kB] Get:118 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ubuntu-mono all 14.04+16.04.20171116-0ubuntu1 [177 kB] Get:119 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 unattended-upgrades all 0.90ubuntu0.9 [32.3 kB] Get:120 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 unity-control-center-faces all 15.04.0+16.04.20171130-0ubuntu1 [180 kB] Get:121 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 xserver-xorg-legacy-hwe-16.04 amd64 2:1.19.5-0ubuntu2~16.04.1 [35.2 kB] Get:122 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 xserver-xorg-core-hwe-16.04 amd64 2:1.19.5-0ubuntu2~16.04.1 [1,347 kB] Get:123 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 xserver-xorg-video-amdgpu-hwe-16.04 amd64 1.4.0-1~16.04.1 [59.0 kB] Get:124 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 xserver-xorg-video-radeon-hwe-16.04 amd64 1:7.10.0-1~16.04.1 [146 kB] Get:125 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 xserver-xorg-video-ati-hwe-16.04 amd64 1:7.10.0-1~16.04.1 [7,100 B] Get:126 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 xserver-xorg-video-nouveau-hwe-16.04 amd64 1:1.0.15-2~16.04.1 [87.0 kB] Get:127 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 qemu-slof all 20151103+dfsg-1ubuntu1.1 [173 kB] Get:128 http://ppa.launchpad.net/rolfbensch/sane-git/ubuntu xenial/main i386 libsane i386 1.0.27+git20180225-xenial0 [2,185 kB] Get:129 http://ppa.launchpad.net/rolfbensch/sane-git/ubuntu xenial/main amd64 libsane-common amd64 1.0.27+git20180225-xenial0 [775 kB] Get:130 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial/main amd64 libxnvctrl0 amd64 390.25-0ubuntu0~gpu16.04.1 [17.8 kB] Get:131 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial/main amd64 nvidia-settings amd64 390.25-0ubuntu0~gpu16.04.1 [949 kB] Get:132 http://ppa.launchpad.net/rolfbensch/sane-git/ubuntu xenial/main amd64 sane-utils amd64 1.0.27+git20180225-xenial0 [191 kB] Get:133 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial/main amd64 ure amd64 6.0.1~rc1-0ubuntu0.16.04.1~lo1 [1,731 kB] Get:134 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial/main amd64 uno-libs3 amd64 6.0.1~rc1-0ubuntu0.16.04.1~lo1 [897 kB] Get:135 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial/main amd64 libreoffice-style-human all 1:6.0.1~rc1-0ubuntu0.16.04.1~lo1 [2,630 B]
Fetched 113 MB in 34s (3,279 kB/s)
E: Failed to fetch http://download.virtualbox.org/virtualbox/debian/pool/contrib/v/virtualbox-5.1/virtualbox-5.1_5.1.34-121010~Ubuntu~xenial_amd64.deb 404  Not Found

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Then I did what it said:

rsteff@ENU-2:~$ sudo apt-get update --fix-missing
Ign:1 http://linux.dropbox.com/ubuntu wily InRelease
Get:2 http://download.virtualbox.org/virtualbox/debian xenial InRelease [7,883 B]
Hit:3 http://linux.dropbox.com/ubuntu wily Release
Ign:4 http://dl.google.com/linux/earth/deb stable InRelease
Ign:2 http://download.virtualbox.org/virtualbox/debian xenial InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Get:6 http://dl.google.com/linux/earth/deb stable Release [1,182 B]
Hit:8 https://repo.skype.com/deb stable InRelease
Get:9 http://dl.google.com/linux/earth/deb stable Release.gpg [819 B]
Get:10 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB] Hit:11 http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu xenial InRelease
Hit:12 http://archive.canonical.com/ubuntu xenial InRelease
Get:13 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]
Err:9 http://dl.google.com/linux/earth/deb stable Release.gpg
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1397BC53640DB551
Hit:14 http://ppa.launchpad.net/libreoffice/ppa/ubuntu xenial InRelease
Get:15 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]
Hit:16 http://ppa.launchpad.net/pipelight/stable/ubuntu xenial InRelease
Hit:17 http://ppa.launchpad.net/rolfbensch/sane-git/ubuntu xenial InRelease Hit:18 http://ppa.launchpad.net/rolfbensch/sane-release/ubuntu xenial InRelease Hit:19 http://ppa.launchpad.net/ubuntu-mate-dev/welcome/ubuntu xenial InRelease
Fetched 315 kB in 2s (153 kB/s)
Reading package lists... Done
W: GPG error: http://download.virtualbox.org/virtualbox/debian xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A2F683C52980AECF W: The repository 'http://download.virtualbox.org/virtualbox/debian xenial InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details. W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://dl.google.com/linux/earth/deb stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1397BC53640DB551 W: Failed to fetch http://dl.google.com/linux/earth/deb/dists/stable/Release.gpg  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1397BC53640DB551 W: Some index files failed to download. They have been ignored, or old ones used instead. rsteff@ENU-2:~$

I'm taking a slightly educated guess here. Did the first run tell me there's a problem with VirtualBox? And did the second one tell me there's a problem with GoogleEarth?

How does one go about fixing those?

--
Regards,

Dick Steffens


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